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Abstract:
A series of single crystals of Sr1-xCaxCuO2, x = 0.19-0.83, has been
grown using a low cooling rate in a flux containing excess CuO. Values
of the temperature gradient, amount of flux, soaking temperature,
soaking time, crucible material and cooling rate have been optimized.
The chemical compositions for the as-grown crystals were determined by
means of energy dispersive X-ray analysis (EDS) in a transmission
electron microscope and confirmed by electron probe microanalysis
(EPMA), while the SrCuO2-type structure having orthorhombic symmetry is
confirmed by high resolution transmission electron microscopy (HREM).
Both the Ca/Sr ratios in the crystals and the unit cell constants vary
with a linear relationship with the Ca/Sr ratios in the initial melt.